Putting the “You” in CPU🔒 SSL Verified

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"Curious exactly what happens when you run a program on your computer? Read this article to learn how multiprocessing works, what system calls really are, how computers manage memory with hardware interrupts, and how Linux loads executables."

"I’ve done a lot of things with computers, but I’ve always had a gap in my knowledge: what exactly happens when you run a program on your computer? I thought about this gap — I had most of the requisite low-level knowledge, but I was struggling to piece everything together. Are programs really executing directly on the CPU, or is something else going on? I’ve used syscalls, but how do they work? What are they, really? How do multiple programs run at the same time?"

"I cracked and started figuring as much out as possible. There aren’t many comprehensive systems resources if you aren’t going to college, so I had to sift through tons of different sources of varying quality and sometimes conflicting information. A couple weeks of research and almost 40 pages of notes later, I think I have a much better idea of how computers work from startup to program execution. I would’ve killed for one solid article explaining what I learned, so I’m writing the article that I wished I had."

"And you know what they say… you only truly understand something if you can explain it to someone else."

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From the beginning… Edit on GitHub